Relieving attachment for lathes



.0. CRONAU. RELIEVING ATTACHMENT FOR LATHES.

APPLICATION FILED HILY 23.1919.

Patented Aug- 24, 1920.

l I g 2 SHEETS-SHEETI.

a l 4 a ATTORNEY lav 6 0. CRONAU. R ELlEVlNG ATTACHMENT FOR LATHES.

APPLICATION FILED JULY 23,.l9l9. v

Patented Aug. 24 20.

V I 2 SHEETS--SHE INVENTOR 0H0 (Irwzaa ATT RNEY lathe.

1 Fig. 2 is a fragmentary plan v Fig.3 is a section taken on the line 3 or UNITED STATES" PATENT OFFICE;

. o'rro onoimu, or new YORK, n. Y. i

BELIEVING ATTACHMENT FOR LATHES.

Specification of Letters Patent;

Application filed July 23, 1919. Serial No. 312,742.

To all whom it mag concern 7 Be it known that I, Orro GRoNAU, a citizen of Germany, and a resident of New York, in the county 0]": New York and State of New York, having invented certain new and provide a very novel lathe attachment of this-character'wherein the work piece is oscillatably suspended, and means ijor continuously imparting axial rotation to the work of an ordinary enginelathe.

My invention further contemplates the provision of simple and effective means for urging the work plece into contact with the tool.

. It is alsoafurthergeneral object of my invention to provide a very simple mounting and arrangement for the oscillatable and continuously rotating work whereby the workmay be operatively connected to the head stock of the lathe in a direct manner and with a minimum of lost motion, the

attachment as a whole being applicable to the ordinary metal working lathe without necessitating any alternations in the latter. 'lVith the above and other objects in view, the invention consists of an improved relieving attachment for lathes as characterized and in the form, construction and combination of its several parts, as Wlllbe hereinafter more fully described and subsequently incorporated in' the subj oined claims. In the accompanying drawings wherein I have illustrated one practical embodiment oimy invention:

Figure 1 1s an elevation partly in section showing a milling cutter operatively mounted between the oscillatable supporting brackets and the driving connection between the axis of the cutter and the head stock of the view.

work piece fixed Fig. at is an end elevation illustrating the operating gearing for the cam member. Referring in detail to the drawings wherein similar reference ch'aracters designate corresponding parts throughout the several views, 5 indicates similar end plates c0nstituting a supporting frame for the several parts of the attachment to be presently referred to.. These end plates are tied to-' gether and rigidly held in spaced relation to each other by means of the longitudinally extending rods 6.

A supporting rod 7 is rotatably'mounted at its ends in the frame plates 5, andj'upon i this red the depending brackets 8 are fixed at their upper ends by means of set screws or other suitable means. These brackets are Patented Au 24, 1920. y

connected to each other by means of a rod 9 and'preferably one-of the brackets may be adj usted' longitudinally with respect to the rods 7 and 9 to position'the center pin 10 carried by said bracket relative to the driv ing splndle for. the tool as will more clearly appear from the following description;

Each of the bracket members is formed upon one side with a transversely extending arm .as indicated at 11 in Fig. 3 of the drawings, and the rod 9 is engaged. in the ends of these arms. 1 1

The other of the bracket'members 8 isformed' at its lower end with a split sleeve 12 the spacedportions of which are connected by the clamping bolts 13. Within the sleeve gaged and a the latter sleeve and constitutes a bearing for one section 16 of a driving spindle The adtension 17 to receive the bushing 18 for a second spindle section 19. This latter spindle section is connected to the section 16 of the 12 a second split sleeve 14 is enbushing 15 is disposed within jacent frame plate 5 is formed'with a hub exdriving spindle by means of the universal joint or coupling member 20;

"21 designates a milling cutter or other on a mandrel or arbor 22, one end of which is mounted in a lathe dog which is fixed by'means of a set screw 24 in thearm 25 secured upon the end of the bushing 15. This end of theshaft is provided- 1 with a seat for the point17 of the spindle section 16. The other end of the shaft. 22' also has a conebearingse'at to 'receivethe centerpin 10;

The outer endof the spindle section 18rre -"--ll"" I 11 immediately acts to return the 'cutter or other work piece to its. normal position in Upon the section 18 ofthe driving spindle a gear 31 is fixed and meshes with a similar "gear 32 mounted upon the stud .shaft 33' which is' mounted in the frame plate 5. This gear 32 carries a pinion 34 wh1ch 1s in constant meshing engagement with a gear 35 fixed on one end of a shaft 36 which is journaled in a suitable bearing 37 formed upon the frame plate. Upon the-other end of the shaft a cam 38 is secured, said cam having a plurality ,ofcam faces 39. I have indicated onthe drawing'six of these eccentric cam faces, though itwill be understood that interchangeable cams may be pro vided having varying numbers of such eccentric faces. These eccentric faces of the cam 38 are adapted to coact with a h1g4!) projecting from the bracket member 8 in which the spindle section 16 is mounted. To the arm 11 of this bracket the lower end of a contractile spring 41 is attached, the upper end of said spring being connected to an arm 42'fixed upon one of therods 6. ;This spring normally acts to oscillate the bracket members in one direction and hold the lug 40 in contact with the eccentric faces of the cam 38. Y Y

Assuming that the cutter or other work hasbeen assembled between the spindles 10 and 16, as shown in Fig. 1 of the drawing, it

will be understood that'this cutter is continuously rotated" with respect to the tool mounted in. a suitable tool post/(not shown).

During such rotation, rotation will also be '3, the bracket members 8 together with the work mounted and supported therebetween will-be swung or oscillated against the-action of the spring 41 and the work thusrelieved from engagement with the tool. As soon as the 111 -40 moves" off of the end'of each eccentric face 39 of the cam, the spring engagement with the tool. In this manner, there is obtained an, intermittent relieving or backing-off movement of the work whereby the work will be accurately eXe cuted and during such movements the work of the flexible driving connection between the shaft 22 and the headstock spindle.

g The universal joint member 20 permits of thenecessaryangular movement of the spindle section 16 with respect to th tion 19 without binding;

said frame and operatively connected to said drive means coacting with the work support to oscillate the latter and:intermittently ree spindlesec- From the foregoing description considered in connection with the accompanying drawings, it will be seen that I have devised a very simple and positively operating relieving" attachment for lathes and one which may be readily applied and used in connection with the ordinary lathe} The cam for oscillating the tool may be readily interchanged so as to obtain any desirednumber of the relieving movements in each rotation of the work. The means for operatlvely mounting the work between the oscillating brackets admits of the easy; and quick re moval of the work piece and the substitution of another work piece in place thereof. The

tween the workpiece andv the headstock spindle is also quite simple, not liable to get out of order, and affords a direct driving connection which is maintained during the oscillating movements of the work. 'Pref erably I provide suitable thrust bearings indicated at 43 between the gear 31 andthe frame platefim V 7 \Vhile I have above described what I have found to be a very practical embodiment of 1;

privilege of adopting *all such legitimate;

changes as may be fairly embodiedv within the spirit and scope of the invention as claimed. Y

I claim: 1. A relieving prisinga stationary frame adapted to be arranged between and supported by the head and tail stocks of a lathe, a work support oscillatably suspendedin said frame, means for continuously'rotating a work piece a;

mounted in said support, and means driven by the head stock spindle for oscillating said support to intermittently relieve the work' from engagement with the'tool.

, 2. A relieving attachment for-lathes com-z j prising a frame adapted to be arranged between and supported by the head andtail stocks of a lathe, a worksupport oscillatably suspended in said frame, flexible drive means forthe work support mounted in said,

frame and driven from the head stock spin dle, and additional means mounted upon lieve the work fromengagement with the tool. is continuously rotated through the medium 3. Arelieving attachment for lathes comprising a frame adapted tob'e arranged between and supported by the head andtail stocks of a lathe, a work support oscillatably V naled in said frame and operatively engaged.

80 arrangement of the driving connections be- '1oo attachment for lathes com- 1 with the head stock spindle, and means geared to said part and coacting with the support to oscillate the latter and intermittently relieve the work from engagement with the tool. 7 a

4. In combination with a lathe a rotatable work support oscillatably suspended between the head and tail stocks of the lathe and normally having its axis disposed in line with the aXes of the head and tail stock spindles, a flexible driving connection between the head stock spindle and said support, and means geared to said driving connection to oscillate the work support and intermittently relieve the work from engage ment with the tool.

5. In a relieving attachment for lathes, a supporting frame, brackets oscillatably mounted on said frame, arotatable work mandrel mounted between the brackets and oscillatable therewith, means for continuously rotating said mandrel including a flexible spindle having a-' part mounted in one of the brackets, and means geared to the other part of said spindle for oscillating the brackets and mandrel to intermittently relieve the work from engagement with the tool.

6. In a relieving attachment for lathes, a

frame, spaced brackets oscillatably mounted on said frame, a work mandrel rotatably mounted between the brackets and oscillatable therewith, means for continuously rotating saidmandrel including a drive spindle having a section mounted in one of the brackets and asection mounted in the frame, a flexible coupling between the spindle sections, and a cam geared to the latter spindle section and coacting with said bracket to oscillate the brackets and the shaft and intion and coacting with said bracket to oscillate the brackets and and the mandrel and intermittently relieve the work from engagement with the tool, and a spring connected tosaid bracket and acting to normally hold the spindle sections in axial alinement and to return the work to its effective position in engagement with the tool.

In testimony thatI claim the foregoing as termittently relieve the work from engagemy invention, I have signed mv name here- 7 unto.

OTTO CRONAU. 

